USN-1831-2: OpenStack Nova regression

Ubuntu Security Notice USN-1831-2

nova regression

A security issue affects these releases of Ubuntu and its
derivatives:

Ubuntu 12.10

Summary

USN-1831-1 introduced a regression in OpenStack Nova.

Software description

nova
- OpenStack Compute cloud infrastructure

Details

USN-1831-1 fixed a vulnerability in OpenStack Nova. The upstream fixintroduced a regression where instances using uncached QCOW2 images wouldfail to start. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Loganathan Parthipan discovered that Nova did not verify the size of QCOW2 instance storage. An authenticated attacker could exploit this to cause a denial of service by creating an image with a large virtual size with little data, then filling the virtual disk.

Update instructions

The problem can be corrected by updating your system to the following
package version: